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You're viewing version 2.17 of the OpenSearch documentation. This version is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

Metadata fields

OpenSearch provides built-in metadata fields that allow you to access information about the documents in an index. These fields can be used in your queries as needed.

Metadata field Description
_field_names The document fields with non-empty or non-null values.
_ignored The document fields that were ignored during the indexing process due to the presence of malformed data, as specified by the ignore_malformed setting.
_id The unique identifier assigned to each document.
_index The index in which the document is stored.
_meta Stores custom metadata or additional information specific to the application or use case.
_routing Allows you to specify a custom value that determines the shard assignment for a document in an OpenSearch cluster.
_source Contains the original JSON representation of the document data.
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